PRACTICAL METHOD FOR MEASUREMENT OF AC-DRIVEN HIGH-POWER LEDS

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Author(s)

Yuqin Zong, Yoshihiro Ohno, Pei-ting Chou

Abstract

Alternating-current (AC) driven high-power LEDs are available and used in SSL products. AC LEDs operate directly from a mains supply and thus have advantages in simplifying product design, increasing product reliability, and extending product lifetime. Accurate measurement of AC high-power LEDs is required for quality control and product qualifications such as US Energy Stars. We have developed a simple, robust method for measurement of high-power LEDs at any specified junction temperature under a normal AC operating condition. In addition to optical quantities, the measurement of an AC LED also determines the thermal resistance between the LED junction and the heat sink.